Writing instrument



FIG. 1 is a front elevational view of an ornamental design for a transparent writing instrument according to the present invention;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view of an ornamental design for an opaque writing instrument according to the present invention;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a top plan view thereof.

The evenly spaced broken lines shown in the drawings are for information purposes only and form no part of the claimed design. The long and short broken lines shown on the side of the cap in FIG. 7 define the bounds of the claimed design and form no part thereof. 

The ornamental design for a writing instrument, as shown and described. 